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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae44b249780552e8a26c5c061e17309ab3cd38c79d62a310637b6d356067ccc' 
  AND token = 'aZL7xWZpKcC5RvlwfGjYO4ztA4eVKGnkDUG26h86Vnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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