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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e853786cc32cc98e1623fd0e47b0d8d49d0aebcb87686ed89d435a13ad77a4' 
  AND token = 'GhdNuxXDcuufejEm9mRk+tkkXICeWk2HQbhXKBV9oJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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