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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c30b6d8de4b797ebe1823b42c0bca59953c60ad61bc2fed964d3e9df54969d1' 
  AND token = 'n0xkDMHYofbvdji/+n4l8ABjJ2A47unikE8Rdq9PNYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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