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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3692b6ae3283db4818e44b5ccc867b00e96b82d6c45fcc04db1eb6f49819bab6' 
  AND token = 'NJ4ZGQxz2UEDnDgDYxzzGC4QI110YnoCHv5ZjdU6ahU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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