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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa27ca074664377d87f4fc5605ff2dbc2c779efe84e1411bdb229c4710bc781' 
  AND token = 'gMD1xJrCMaRGD70JR0mLrZjoMIH7G1X5UkCG3q/j4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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