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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a20e66cabf387098a81cf0b62ca625baa50cbba4c9d8017f58935e1c507b71' 
  AND token = 'pmb+pl7krDHgqKopU1wfmYQBJnJ/UKfbsTmW7cv90uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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