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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1351ba0bc731227c89c38aa22446e4e83511f53738202fd820965e024a4443f4' 
  AND token = 'uoCjdY9veiI0XZfC90Nxyhw4gCyllTuY1cS4TL8kwr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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