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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e3491521e9f28b3a9368c5b25adfe6262175e8c645c947629505d54c5add54' 
  AND token = '8tNM9BbrFpnuriGJUbJkI3eHo26Ut7jZWrsOh5lo73E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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