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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405abdc03239d57a20689baa2450a76cc873363cbbef03ab5041f67f5eb27966' 
  AND token = 'XUcH37t+MzVCys9QSFNyJbndVB5EXw1kUFTQShsrObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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