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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a386cc8df2f67c8b682e2c7d82b54f975850252f68c841bf6dacd72ad431a446' 
  AND token = 'uz5OEK/KOk33wK7UcRVX6j7aO/784pPIEb12IQSIjY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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