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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255bb2e5ed56fb28b7312ee1e831e0879fcd7f6bdd1dec4674a12d5be208c7ab' 
  AND token = 'qpfMnSBrfmnSO21F3ojMgu4ajG6vf5C0lG67H8XMsTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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