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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5dfa6d3a4359206d8f7e1e2a18526a476d89c0009232bcb30e58ccbbdd7de2' 
  AND token = '/GZ7Xn9eg/Z5bFwRkRsXBDB5Ta/h6rgkJGUxjRaof8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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