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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dec56c52fc63732267907537b8a03326096a397dd3a6d796fc84fd1b7fc94e5' 
  AND token = 'ZBuv/It9j00qIqjN7nsPYgqSPX9qTruGR8niT6b+Myc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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