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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaff4752afc03b2894be87d142f7c9c4a56e91c9043ade609ec860862a1eb02' 
  AND token = 'lHDmzUWMjI9gb9N9csWW/kQpUF7BJie+lY7lYNk6mkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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