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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb78accad68ba852658b4ccafdf6f61b6c585a260ce969e842d2fa148cd5d7b5' 
  AND token = 'OHemUw3aO0uLyl11elVioro5qhfzqbQZfXz/6Qh9HsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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