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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eb435e50e34935c35b7d6ec49555e13d896451edf0a210b4c2b494f60bfce7' 
  AND token = 'NVqF7Jev1c9Cumkwg0PijrHg/siQyfCLBaezHb8x7xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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