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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96ce29a0af62655417785f89b03df167db1fbf4d09386177c9e7a1d021b58f4' 
  AND token = 'H+esImn/D8CjsoCpiCDozgEK4gctD3sdQ//IDyazKFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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