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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876324619b84452c7923b19cca8dabb354f9ca3454815fc5665619c40cc26768' 
  AND token = 'm0W9+lfTi1AagvdXt5Z3wLaGGjZ9DiNu26NqCiS24X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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