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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ce9af0488e109b304c862a1ad2c9f5e5192cf8fc76a71e97b8bab2d3646272' 
  AND token = 'UmA7ekwDiFs+mNOH287TfQkCJUeUPxgS5YroVU4GvY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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