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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a569172204187185207892a7e8a3614520e0caee9e4147a54759b6a300c361' 
  AND token = 'LTYm5abRiCQI4RqZ3c+E0HEmJdYpONa3og+ZvlA95II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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