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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89263edf1f7cb18216d8a874dce0ea50ccce61569c04eae47d2a80ed6a858fe' 
  AND token = '72+fJkgzmRDlWdv8N37IPpzDpCWCE4xo0rGWPPng720=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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