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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb10340545118d36e051ec23e0d396b83e1409a8215bfeb3c27291599f5db6c' 
  AND token = 'X+P06fGHsYMfG96CRzMH+FGeZ7NpmwV9pSUtEogngtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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