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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca15b0e8b5c36beb211c5ac1e27d59ee6403bf3cc1f8fb02bef4ed73dc317029' 
  AND token = 'KsuWxxqM/plhydn+Bqecq1fmeVb/krCJ6w9n+NK7UTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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