SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baeefe45ab9e8bc6367c6b11917e29e3b2068a27b3553974092f81b5175f65a' 
  AND token = 'R1S+FHE7Be/zFYZdwUPwEh48h8DHaKwgTnIsb6n3lgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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