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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599cdb2787197d8cbce0ed9a9e097215c8e07b6926d5a6a7bae5db071d3600e2' 
  AND token = 'r+OZQjUFud9Lk7QyADeGqE+1uwyFeBXWT0D0RyWQGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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