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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c50aebfb4889014fced1b4254aed92dff75e0e932206234808251a73baa5b3' 
  AND token = '9DSpj78Pwawx/7YmoVF4zsrDJJEPaH129JIN+GuD/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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