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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3472b19440c4cb66dbd379a16a8fe820c206fec0a7d19f9711e4beba19733744' 
  AND token = 'vQ0znUmbb9f367ubjpqvrmT/6dHEIKEqVP9rAyWzOrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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