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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edb10bebdd4d0c8c86359b3b7baca8bd17d14d0c15e864c6e9b6b5b607b8171' 
  AND token = 'LTCrJ+Kkbtv9Eab542zEi+So/aNlN8wpSfUGIacyY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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