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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e625e01b7de43ce6c2bafcd99ee1923edd56dcb68570d1ec5cc307a439e477cb' 
  AND token = 'EmcaE/b8i3G8wKOfIj6gC0GcZwTxt2/+ZNjrbLEVL9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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