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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717d676afc0b5a7fd62add5af56de31e526f4467488b45a6978e8988bd9804b6' 
  AND token = '6cpQV4w5FLES4tcwuE0p7EWdrF8mvfAZFJqcB65+fpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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