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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d639471f03a7768354467bc76690c924c7f854fd4e13275a1a36f9c19b29ba' 
  AND token = 'AfVz5U6ecVAFLW7MU/7c1Sp5SBztLfQ7akEdxQq2J7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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