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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95e96b23d941b47fba39ed452c97fdbbac3b9a9ca45af51d9baa7775dd95f7c' 
  AND token = 'vcK96MC6wYQHAGl9+Exqn2mOqBaqC5mVvRV6okbzPsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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