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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aceb8d190fcf88aba812451617eb24713fec8c1ae398c1a9b4849c4b6ecbb5b' 
  AND token = 'Hgu8Pv2Q1e1kkvuzDq3El668OzPwot+rz09AoJtJ7DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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