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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6b91b292b06bcf4ce194a1caf1f5b22a4dab4ea3c044006eba86cdf1c7ba22' 
  AND token = 'UEZIdYbdV7MgpsWovw2BjaihsoqrWUcWmk+mFDLldE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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