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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d2a141f012a3ee8cfbf3d1adcb45a3afea75e5056f0782facd31bfea1ff8f3' 
  AND token = 'UUMt1Bjd2rC418owHGzqCEWfZjg3823jGpXY+g953PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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