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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861c8856e2f5eb989196e4bdab7cd623ec89c54bafec087801a51aa0633f1b1b' 
  AND token = '7fWS3kPk+2rfPQrYREueD+x/wilerbaP5jr4SZ65uS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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