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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641c469ea31a9b5ab8d1f7e1fbf703ae0d560559989945beb8aab18678ad6166' 
  AND token = 'iFfdzcTNGmEYralgMWMH7Ys9DHPXpkKnPYj59Lljgh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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