SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e656eca7cbff0e278160b9b097684e96dfcd97c6559b1c58812ba03c38923b' 
  AND token = 'kgoZB3/QE0Q9Fdloz4o+FsIvmnph35PSCFUBZ1kvYHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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