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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0709d976c7cc051427c85f27da22d93bfb1963c8703f3362e34755e310f8d7' 
  AND token = 'TyzVRZL/pGV5BN72M/4c7HH3pFUkGOsPozmOY1E+1/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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