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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2952c72ceb5f5ca3867a0a59b885475f5d548d2328c2a2bd8a03e32bb23ccf84' 
  AND token = 'pSEwZiEbF+zL7ntRTGFm3l5dFVeNzOkTaPFGIl2yiM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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