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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac5a94e3771515529d109d6ab8e08b14b74893417efff9a85cf1a5d4fd82592' 
  AND token = '7NU+NUaNdy8EJroF7ZJ6xMi+gf/IqMvumQkLDEiDCc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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