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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57354dd15b88222c7a76ec0213b8e5896f7a50542be05185acb62c832d085d8' 
  AND token = 'FYrhNw5oEapHK5E02f956Ti1SqrjDfvR6eBt8Z037RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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