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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8060c92276b1097e8f6e40cfabb482a8ed4c7510d9e0e781e0f07efd48f070' 
  AND token = '7WJXmZasVs11wdeW2fehuVqiRh+NNb+ucayAx9FDn10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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