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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd149e05ae62092a73ad90a4a7b4e7612a17db4278dea73fb2654989d55e686' 
  AND token = 'rAxNdTkuVsiQivzXl/kHRFcMr9qslYG9xguiWQX1ho4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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