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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24759fd5f24a301cc1553fdd8223e72c8096da4dbe02bd861a00167ed71f2df' 
  AND token = 'vTdEjUTL994/rV/B7Z5yDwJpxpq0lAT2o+0cNOGfIrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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