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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08a1b0226a4377da1495a2c68cba3bf5dd55649abffc80d82ac2885e6fff8ba' 
  AND token = 'Y1gu0G5Dp0WgeVW5n0PVvGv96B4flN/G0SVrx24wbfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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