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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7110fd56891d84f7e75c5dccadb1ffc726df31c49785b8f96bf6b3eb087f528' 
  AND token = '8reikGj+nlqXVQuPmdGtAOPSaei6Z5JSCTb2lJy4018=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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