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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4834ec6d1f810567161936df86ebd677424ba8fb41e9e9389004bf2226fa0880' 
  AND token = 'X5AM/w98svRWXHapO1gBTkqAYpCDz4AF9XdQ03hkcxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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