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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df357a15be3d24610de93902cc11c9550f75ed30c1537bef8194f4e14f4efaa6' 
  AND token = 'Va9Dj3xgg8DQJuU3qJdPnISv451oVayfE71sgTvWlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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