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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56680da64c632e61172e4342aa288755f1efea6bd2214f31ac2001ac3cf86213' 
  AND token = 'xH3QWJIT7zP0aNvuCW6tBKv2Koe85xRgyDUVrzqH1lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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