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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4b37e2cebb6d2d2127e98b172d2ea215bb4d8a6acb8284dc097c4003aae77c' 
  AND token = '0vs+YT7RgCnR9N5JdOkfLETozqbpSU8XMKK2OaTePS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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