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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9fb326e38eb283c2eb5fa8d62bacf1e1ed49d6b9c5a4d3e9d83f0349062aa9' 
  AND token = 'OZKm+XrapkuKR3cg65bCLjNtI60hDC5+02MqDN5txx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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