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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab312eacce2d542fb376a5952f593acd38b734789f3c22485bb62d997712d3e' 
  AND token = 'vpzRF0SNFqnoWp3ck2khrJMnsmMcig4wcVPU4pHPNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}