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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd0b183e391deb25612eadcf363dc7f948d92d354ab6d9e833f94054890813b' 
  AND token = 'WVCiPL3pKTweydrr9G5dRXGEU9PWDKQZBEcQw+aoiwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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