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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df00cb9a70b139e295c472e2654d416e51bd2da4841176cb1c0f92739c2de85' 
  AND token = '9cttDr1j9Aj9Vpq87xwU31BalGowvfCKs6VB8YANZKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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