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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34720d75ad4cdd22b9031ffe2d7a6a9213819be9c5f03c48478e3532a200e9ad' 
  AND token = '0zplUXx4ieL1iCqU1TpnCh7tMNVDm32BlTOLwUPU3Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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