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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf998df16e9b8dafc6fa3f9c0b833ebb0ad759f77ff9925edc80881fb6323adb' 
  AND token = '7MB5oxesvSWTmjK0mO6PzPvjS0jjAb1wn7eV2+Rby0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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