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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0cf161b2cd8c065973068ca21c3db4c8520a6edd921c08584d6874ef813c48' 
  AND token = 'bdestfJdKfva/72QHr6OOqO2C9dSF+BN8qE8nPUkXgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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